Hot-blast stove.



-K. L. LANDGREBE.

HOT BLAST STOVE.

APPLICATION FILED NOV. 5. INS.

LJLMfiQQ. Patented May 23,1916.

2 SHEETS-SHEET 1- K. L. LANDGREBE.

HOT BLAST-STOVE. APPLICATION FILED MW. s. 1915.

11 11. GQQ. Patented May 23,1916,

2 SHEETS-SHEET 2.

s ra rns Para amen.

HOT-BLAST srovn.

Specification of Letters Patent.

Patented May 23., 1916.

Application filed November 5, 1915. Serial No. 59,756.

To all whom, it may concern Be it known that I, KARL L. LANDGREBE, acitizen of the United States, and a resident of Ensley, in the county ofJefferson and State of Alabama, have invented certain new and usefulImprovements in Hot-Blast Stoves, of which the following is aspecification.

The present type of stove consists of a single shell havin within it thecombustion chamber and heating chambers, the heating chamber beingfilled with checkerwork and the combustion chamber being unobstructed.

The object of hot blast stoves is to heat air forced through the samefor use in blast furnaces and the like. The checkers are heated by meansof gas from the blast furnace and air combining in the combustionchamber and being. drawn or forced through the checkers, thereby heatingthem. When sufiiciently heated, air is forced through said heatedcheckers, absorbs heat therefrom and is directed through the combustionchamher into the blast furnace.

In the present type of stove great difficulty is experienced in theburning through of the walls. of the combustion chamber, thereby harmingthe checkers in the heatingchamber, necessitating shutting down thestove for repairs. As ittakes a long time for the checkers to coolsufliciently to permit men to enter the stove to make repairs, a greatamount of time is lost, as the heating chamber cools much more slowlythan the combustion chamber.

The object of my invention is to provide an arrangement which makes thisstove a one-pass stove as compared with the two, three and four passstoves which are in use at the present time. The advantages can bereadily seen that the gas burned in the combustion chamber is leddirectly into the checkerwork and after heating the same, the wastegases are exhausted by a stack on the top of each individual stove, thesame as the present three-pass stove. After the stove is heated, the airfrom the blowing engines to be heated is passed down through the.-.checkerwork, thence through the combustion chamber, which is attachedby connections below the arches sustaining such checkerwork, and thenceby a hot blast connection to the furnace.

Another feature of this stove is the preheating of air used for thecombustion of gases by absorbing the heat of radiation from thefirebrick walls of the combustion chamber and the connections joiningthe combustion chamber with the stove proper.

Air for this purpose may be drawnthrough the annular space surroundingthe shell of the combustion chamber and connections, by the naturaldraft of the stove as shown, or the air may be forced in by air from thecold blast main or fan blast. The preheating chamber is made by buildinga steel plate jacket around the shell of combustion cham her andconnections with a further connection from this chamber direct to thegas burner.

Attention is also called to the arrangement of the firebrick pierssupporting the arches which hold the checkerwork. These piers are soarranged that ample alleyways are formed for the perfect distribution ofthe gases as they come from the five connections leading from combustionchamber to stove proper. The combustion chamber is built of suflicientheight so that the full flame reaction, which takes place in the burningof the gases, will take place in the chamber and ways, and I considerany modification 'of a separate combustion chamber and a heating chamberconnected 1n any manner with the bottom or side of stove or heatingchamber and which allows the incoming gases to pass around piers andarches underneath the checkerwork and up through same as coming withinthe scope of my claims and the spirit of my invention.

The invention will be more readily understood by reference to theaccompanying drawings, wherein Figure 1 is a vertical section through ahot blast stove constructed in accordance with my invention; Fig. 2 is asection on the irregular line 2-2 of Fig. 1, and Fig. 3 is a plan viewof the tier and coluinn construction by means of which the stove issupported.

As shown in the drawings, the stove may be of usual constructioncomprising an inner brick lining 10, an outer metal shell 1'1, andcheckerwork 12. Projecting axially from the upper end of the stove isthe chimney 13. Likewise, in the upper end of the stove, an entrance isprovided from the cold blast main 14, the entrance being through theelbow 15 and the valve 14*. The checker work is supported on suitablearches 17 and the piers 18, the piers being so located as to provide forthe fullest disposition of the heated gases from the combustion chamber.The piers 18 rest upon the bottom of the stove which is supported bystructural work 19, which, in turn, is supported by the columns 20, bestshown in 3. The upper edge of the structural work is located at thefloor line, which is indicated at 21. The advantageous result vained bythis construction is inthat all of the combustion chamher andconnections are beneath the floor line, thus economizing on space andmaking a much neatei' arrangement.

The combustion chamber is indicated at 22, and is located axially of thestove, connections being provided to the spaces or alleys 23 between thepiers by means of an axial outlet 24 and four diagonally disposedconduits 25, the latter communicating with the sides of the stove and,consequently, the outermost of the alleys 23. Gas is supplied throughthe main 26, from which it is piped to the burner 27, where it is mixedwith air drawn in from around the combustion chamber and connections. Toaccomplish this result, it will be noted that I have provided asecondary shell 28 for the combustion chamber and connections, anopening 29 being left through which the air enters. It will be seen,therefore, that the heat radi ated from the combustion chamber isutilized to preheat the air used in combustion. The hot blast main isindicated at 30 and communicates with the combustion chamber by aconduit 31 controlled by valve 32.

The operation is as follows: Gas being admitted from the main 26,combustion is started in the burner27, being completed in the combustionchamber 22. The heated products of combustion pass upward through theconnections 24, 25 into the alleys 23, at which point they are fullydistributed over the checkerwork. After passing through the checkerwork,the gases escape through the chimney 13. When the stove is to bereversed, the gas is shut off, the cold blast valve 14 is opened, thehot blast valve 32 likewise opened, and the chimney valve 16 is closed,whereupon the air from the cold blast main is forced through thestove onits way to the blast furnaces. An important advantage gained bythe 'useof the construction. shown is in that there is a direct pull on thegases by the stack resulting in a much freer flow through the stove. Aresult of such construction is that the time required to heat the stovewill be shortened materially.

I claim:

1. In a hot blast stove, the combination of a shell, checkerwork withinthe shell,

arches supporting said checkerwork and piers supporting said arches, anda combustion chamber located beneath said piers and communicating withthe space around said located axially beneath said stove and con-' duitsconnecting said combustion chamber with said stove at the axis thereofand at a plurality of points at the periphery of the stove,substantially as described.

3. In a hot blast stove, the combination of a shell, checkerwork, piersand arches supporting said checkerwork, a structural framework uponwhich said piers are built and columns supporting said framework, saidframework being located at substantially the floor line, and acombustion chamber located beneath the floor line, substantially asdescribed.

4. In a hot blast stove, the combination of a shell, checkerwork, pierssupporting said checkerwork and providing a plurality of alleysunderlying the entire body of the checkers, a combustion chamber and comduits providing communication between said combustion chamber and saidalleys, one of said conduits being located axially of the stove andothers of said conduits extending radially from the stove, substantiallyas described.

5. In a hot blast stove, the combination of a shell, checkerwork, pierssupporting said checkerwork and providing a plurality of alleys disposedbeneath the body-of the checkers, a combustion chamber located axiallybelow said checkers and providing communication with the checkersaxially and at points near the periphery of the stove, substantially asdescribed.

6. In a one pass hot blast stove, the combination of a shell,checkerwork filling said shell, a stack outlet and a cold blast inletbeing provided at the top of the stove, and a hot blast outlet, acombustion chamber and a burner at the bottom of the stove, saidcombustion chamber being located axially of the stove, and means fordistributmg the heat from said burner to all portions of saidcheckerwork, substantially asde-- scribed.

'7. In a hot blast stove, the combination of a shell, checkerwork withinthe shell, the checkerwork being located above the floorline, acombustion chamber axially ar ranged with relation to said shell andlocated beneath the floor-line, a burner connected to said chamber, andmeans for dis- 8. In a one pass hot blast stove, the combination of .ashell having an axial opening at either end, checkerwork Within saidshell, said checkerwork filling the shell at all points in its crosssectional area, a combustion chamber located in line With the axialbottom outlet from said shell, a burner connected to Said chamber, and aplurality of flues projecting radially from said shell at the lower endthereof and communicating with said chamber, substantially as described.

9. In a hot blast stove, the combination of a shell, checkerwork and acombustion chamber, said combustion chamber being separate from saidshell, said checkerwork being positioned above the floor line of thestove, said combustion chamber being positioned axially of the stove andbeneath the floor line, and connections between said combustion chamberand said stove, substantially as described.

Signed at Ensley, Alabama, this 19th day of October, 1915.

KARL L. LANDGREBE.

Witnesses:

E. K. MILLER, JAMEs P. DOYLE.

\ Copies of this patent may be obtained for five cents each, byaddressing the "Gommissloner of Patents,

Washington, D. 0.

